The interaction of racemic thiiranium cations and some chiral TRISPHAT anions is reported. Racemic tert-butyl substituted thiiranium ions were chosen for their greater stability with respect to less hindered thiiranium ions. Anions L-BINPHAT and D-TRISPHAT were tested. The use of L- BINPHAT anion allowed a complete separation of all the proton NMR signals of trans-di-tert-butylthiiranium ion and of trans-phenyl-tert- butylthiiranium ion, whereas D-TRISPHAT anions cause the splitting of the ring protons signals only. This is the first report on the NMR enantio- differentiation of chiral thiiranium cations.
NMR Enantiodifferentiation of thiiranium cations by chiral hexacoordinated phosphate anions
2002
Abstract
The interaction of racemic thiiranium cations and some chiral TRISPHAT anions is reported. Racemic tert-butyl substituted thiiranium ions were chosen for their greater stability with respect to less hindered thiiranium ions. Anions L-BINPHAT and D-TRISPHAT were tested. The use of L- BINPHAT anion allowed a complete separation of all the proton NMR signals of trans-di-tert-butylthiiranium ion and of trans-phenyl-tert- butylthiiranium ion, whereas D-TRISPHAT anions cause the splitting of the ring protons signals only. This is the first report on the NMR enantio- differentiation of chiral thiiranium cations.File in questo prodotto:
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